Rename keys of deeply nested hash based on schema.

# From...
bad = { posts: [{ id: 11, comments: [{ id: 22, author: 44 }] }] }

# to...
good = { articles: [{ id: 11, opinions: [{ id: 22, writer: 44 }] }] }

# using...
schema = Schema.new({
  articles: ArrayOf.new(:posts, Schema.new({
    opinions: ArrayOf.new(:comments, Schema.new({
      writer: From.new(:author)
    }))
  }))
})

# by calling...
schema.rekey(bad)
# or...
Rekey.rekey(bad, schema)

# which means that...
schema.rekey(bad) == good
Rekey.rekey(bad) == good

gem install rekey.rb

Require and include like this:

require 'rekey/rekey'
require 'rekey/from'
require 'rekey/array_of'
require 'rekey/schema'

include Rekey

To rekey you must start with a Schema.

#new(definition)

When instantiating a schema you must pass a definition. The definition is a hash. The keys of the definition are the keys you wish to extract and the values are rekey schemas.

When you only want to rename a key you use From.

#new(key)

When instantiating the From schema, pass the name of the key you want to rename from.

When you are extracting from an array use ArrayOf.

#new(key, schema)

When instantiating an array schema you must pass the key from which you want to extract the array, and the schema you want to run over all the values.

The MIT License (MIT) Copyright (c) 2016 Christopher Okhravi

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